Hydraulic brake



0a. 10, 1939. H. D. GEYQER 2,175,433

HYDRAULIC BRAKE Filed Jan. 16, 1939 I Bmaentot g 27% q (IttomegsPatented 10, 1939 HYDRAULIC BRAKE Harvey D. Geyer, Dayton, Ohio,asaignor to Gen- Mctol's Corporation, Detroit, Micln, a corporation ofDelaware Application January 16, 1939, Serial No. 251,103

:Olaims.

This invention relates to brakes and has been designed particularly asan improvement in the mounting of the wheel cylinders of hydraulic brakesystems as used on vehicles.

An object of the invention is to prevent the chattering or rattlingwhich sometimes occurs when the brakes are applied.

.Other objects, such as the accomplishment of the above major object ina way which shall be efl'ective and comparatively inexpensive, will beunderstood from the following description.

The invention is illustrated by the accompanying drawing in which:

Figure l is a view in elevation andl5 Figure 21s a section on line {-2of Figure 1.

Referring to the drawings brake drum ,is shown at i. This is the drumwhich rotates with the wheel of the vehicle. At 1 is a cover plate. Itdoes not rotate with the wheel but is fixedly carried by the rear axlehousing or the front axle steering knuckle as the case may be. Withinthe drum are shoes 8 and II. The shoes are adaptedto frictionally engagethe drum and may be anchored in any convenient way to the cover 1. Tospread the shoes into. contact with the drum there is a. so-called wheelcylinder II of the conventional hydraulic brake system. As

is usual, this cylinder is secured to the cover plate between one pairof adjacent ends of the shoes. It is equipped adjacent each end with apiston l5 and a packing ll. The outward movement of the pistons istransmitted by pins 19 havin notches 2i engaging the webs II of theshoes. Adjusting cup shaped nuts 25 embrace the ends of the cylinder,are threaded on the pins [8, and are adapted to abut the ends of thecylinders under the influence of a retracting spring 21. The packings iiare separated and held against the pistons by a spring 20.

o Fluid is forced by a master cylinder, not shown,

through the usual conduit and aninlet II to the space between thepistons. To hold the nuts 28 in adjusted position, a spring clip 33 issecuredto the cylinder at 35 and engages at its ends notched portions 31on the nuts 25.

The notched ends of the pins are somewhat 6 flared and chattering noiseshave been found to occur between the web of the shoe and the notch. ofthe pin resulting from a relative sidewise movement of the web in thenotch. In the present installation, the axis of cylinder It and 10 itspins is shown by line 11-12. This axis is arranged at a small angle, afew degrees, to the line 0-0 representing the plane of'the shoe webs./In this way the webs of the shoe not only engage the bottom wall of thenotches of the pins '15 but also engage side wallsas shown and thechattering caused by a movement of the shoe web within the notch isavoided. The pressure of the pins has a small component holding the websagainst side walls of the slots as will be seen by 20 reference toFigure 2.

I claim:

1. Brake mechanism including a rotatable drum, shoes to engage the drum,said shoes having webs. a cylinder between spaced ends of said shoes. 25

pistons reciprocable within said cylinder, pins interposed between saidpistons and said shoe webs, said pins having slots to engage said webs,the axis of said cylinder and pins being angularly related to the planeof said shoe webs.

2. Brake mechanism including a rotatable drum, shoes to engage the drum,said shoes having webs. a cylinder between spaced ends of said shoespistons reciprocable within said cylinder,

pins interposed between said pistons and .said shoe webs, said pinshaving slots to engage said webs, the vertical plane containing the axisof said cylinder being angularly related to the vertical plane of theshoe webs.

HARVEY D. em.

